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目的    探讨球基曲与j钩联合应用技术辅助矫治磨牙支抗丧失效果。方法    2006—2008年厦门市第一医院思明分院拔4颗第一前磨牙进行矫治的患者13例，23颗上颌第一磨牙在采用直丝弓技术矫正治疗过程中出现支抗丧失，联合应用球茎曲与“J”钩对其进行矫治，治疗3～5个月后，观察上颌磨牙向远中、颊向移动情况。结果    13例患者23颗近中移动或倾斜移动的磨牙，联合应用球茎曲与“J”钩治疗后，上颌磨牙平均远中移动（3.97±0.85）mm，颊向平均移动（0.90±0.61）mm，结果有统计学意义（P < 0.05）。13例患者均成功达到磨牙、尖牙一类关系，前牙覆牙合、覆盖正常。结论    联合应用球基曲和“J”钩是一种有效的矫治支抗丧失磨牙向远中方法。

Combined application of ball joint loop and J-hook headgear to the treatment of loss of molar anchorage

Objective To study the clinical effect of combined therapy of ball joint loop and J-hook headgear for the loss of moalr anchorage.Methods Thirteen patients were treated in the First Xiamen Hospital from 2006 to 2008.A total of 23 teeth had anchorage loss during the treatment with straight wire.Combined therapy of ball joint loop and J-hook headgear was used.Observe the treatment results after 3 to 5 months.Results After the treatment,the average middle and distal movement was（3.97±0.85）mm,and the average buccal movement was（0.90±0.61）mm.The result had statistical significance（P 0.05）.Success was achieved in all the 13 patients.Conclusion Combined therapy of ball joint loop and J-hook headgear is effective in treating loss of molar anchorage.